package cn.tedu.v3;

import java.io.*;
import java.net.BindException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 * Version 3.0  升级  双向链接【客户端与服务器端相互说话】
 *
 * 优化空间：优化结构、流没有关闭
 */

public class Server {
    private ServerSocket serverSocket;
    public Server() {
        try {
            serverSocket = new ServerSocket(7788);
        } catch (BindException e) {
            System.out.println("端口号重复申请，建议换个端口号");
        } catch (IOException e) {
            System.out.println("申请端口号失败~~~");
        }
    }

    public void start() {
        try {
            while (true) {

                System.out.println("----等待用户端链接---");
                Socket socket = serverSocket.accept();
                String ip = socket.getInetAddress().getHostAddress();
                System.out.println(ip + "客户端链接成功了");


                new Thread(new CS(socket)).start();

            }
        } catch (IOException e) {
            System.out.println("服务器端通讯断开了");
        } finally {

            if (serverSocket!=null&&!serverSocket.isClosed()){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    System.out.println("服务器关闭失败");
                }
            }

        }
    }


    public static void main(String[] args) throws IOException {
        new Server().start();
    }


    private class CS implements Runnable {
        private Socket socket;

        private String ip;

        public CS(Socket s){
            this.socket=s;
            ip=socket.getInetAddress().getHostAddress();
        }

        public void run() {
            //BufferedReader br = null;
            PrintWriter pw=null;
            try {
                //1.定义读入
                BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF8"));
                //2.定义写出
                 pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "UTF8")), true);

                //1.1读入功能：存线程
                new Thread(()->{
                    try {
                        String message;
                        while ((message=br.readLine())!=null) {
                            System.out.println("客户端说："+message);
                            //增加写出一句话：读完之后的等待读入
                            System.out.println("服务器端请输入：");
                        }
                    } catch (IOException e) {
                        System.out.println("客户端读入失败了");
                    }
                }).start();
                //2.1 提供写方法：控制台输入
                Scanner input = new Scanner(System.in);//后台卡住
                while (true) {
                    System.out.println("服务器请输入：");
                    String say=input.nextLine();//得到控制台输入值
                    //打印：服务器端说的文本--打印客户端
                   pw.println("服务器说："+say);
                }



                }catch(NullPointerException e){
                    System.out.println("IO流传入对象，有对象为null,立马核对，建议：查看try块中对象可能赋值为null");
                } catch(UnsupportedEncodingException e){
                    System.out.println("客户端或者服务器端：字符集不一致");
                } catch(IOException e){
                    System.out.println("通讯过程中，传输出现错误！");
                } finally{
                    /*if (br != null)
                        try {
                            br.close();
                        } catch (IOException e) {
                            System.out.println("结束通讯：关闭失败");
                        }*/
                    if (socket!=null&&!socket.isClosed()){
                        try {
                            socket.close();
                        } catch (IOException e) {
                            System.out.println("通讯关闭失败");
                        }
                    }
                }
            }
        }
    }


